Contents

General Info

Review of Dynamics

Terms

Further Reading

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Who provided a basis for the study of dynamics?

(A)
Galileo

(B)
Newton

(C)
Kepler

(D)
Einstein

What are the units of force, in terms of fundamental units?

(A)

(B)
Newtons

(C)

(D)
kg·m

Inertia is the tendency of an object to remain at constant

(A)
Acceleration

(B)
Position

(C)
Speed

(D)
Velocity

Which of the following constitutes an inertial reference frame?

(A)
A satellite in orbit

(B)
An object moving in uniform circular motion

(C)
A car moving with constant velocity

(D)
An object in free fall

What is the weight on earth of a 50 kg person?

(A)
490 N

(B)
9.8 N

(C)
50 N

(D)
Not enough information

What is the weight of a 50 kg person in outer space?

(A)
490 N

(B)
50 N

(C)
O N

(D)
Not enough information

In what way are force and acceleration related?

(A)
Inversely proportional

(B)
Directly proportional

(C)
F
is proportional to
a2

(D)
There is no relation

A 10 kg mass experiences a force of 20 N. What is its acceleration?

(A)
2 m/s

(B)
200 m/s

(C)
0.5 m/s

(D)
20 m/s

An object with mass 2 kg moves with a velocity of 10 m/s. What is the net force
on the body?

(A)
20 N

(B)
0 N

(C)
5 N

(D)
20 N

What are the units of weight, in terms of fundamental units?

(A)

(B)
Newtons

(C)

(D)
kg

An object of mass 1 kg experiences two equal and opposite forces, each of 10 N.
What is its acceleration?

(A)
20 m/s
2

(B)
10 m/s
2

(C)
0

(D)
12 N

A force of 3 N and a force of 4 N act together to produce a resultant force of 5
N. What must be the angle between them?

(A)
0

(B)
90

(C)
180

(D)
Not enough information

The net force from two distinct forces is at a maximum when the angle between
them is

(A)
0

(B)
45

(C)
180

(D)
90

Three forces, each separated from one another by
120
o
yield a net force
of 0.
What can be said about the magnitude of the forces?

(A)
They add to 0

(B)
The sum of the magnitude of two forces must equal the magnitude of the third
force

(C)
They are all equal

(D)
Not enough information

An object is said to be at equilibrium if

(A)
It is moving at constant velocity

(B)
It is moving at constant acceleration

(C)
No forces act upon it

(D)
No net force acts upon it

A man pushes on a 10 kg crate with a force of 50 N. What force does the man
experience?

(A)
50 N

(B)
500 N

(C)
5 N

(D)
0 N

What is constant for a freely falling object?

(A)
Velocity

(B)
Position

(C)
Speed

(D)
Acceleration

The acceleration due to gravity on the moon is 1/6 the value of that on earth.
What is the weight of a 100 kg man on the moon?

(A)
163 N

(B)
100 N

(C)
17 N

(D)
238 N

Which of Newton's Laws relate the force of two mutually interacting bodies?

(A)
1st

(B)
2nd

(C)
3rd

(D)
4th

Which of Newton's Laws define the concept of inertia?

(A)
1st

(B)
2nd

(C)
3rd

(D)
4th

Two surfaces are in contact. The normal force between them always points

(A)
Vertically

(B)
Perpendicular to the plane of contact

(C)
Horizontally

(D)
Parallel to the plane of contact

A 10 kg mass rests on an inclined plane with angle of elevation of
θ
.
What is the magnitude of the normal force?

(A)
98 N

(B)
10 N

(C)
98 sinθ
N

(D)
98 cosθ
N

The normal force is a direct consequence of which of Newton's Laws?

(A)
1st

(B)
2nd

(C)
3rd

(D)
4th

Frictional force is the result of what kind of fundamental force?

(A)
Gravitational Force

(B)
Nuclear Force

(C)
Normal Force

(D)
Electrical Force

Frictional force always acts in what direction relative to the motion of one
body relative to the other?

(A)
In the opposite direction as the motion of the body it is being acted upon.

(B)
Perpendicular to the plane of motion

(C)
In the same direction as the motion of the body it is being acted upon.

(D)
Horizontally

A 10 kg block is at rest on a horizontal table. The coefficient of static
friction between them is .5. What is the frictional force acting upon the block?

(A)
49 N

(B)
5 N

(C)
0 N

(D)
98 N

A 10 kg block lies at rest on a table, with a coefficient of static friction
between them of .5. A horizontal force is then applied of magnitude 50 N. What
is the frictional force acting upon the block after the force is applied?

(A)
48 N

(B)
0 N

(C)
98 N

(D)
Not enough information

The coefficient of static friction is related to the coefficient of kinetic
friction in what way?

(A)
The coefficient of static friction is always less than the coefficient of
kinetic friction

(B)
They are equal

(C)
The coefficient of static friction is always greater than the coefficient of
kinetic friction

(D)
Not enough information

A block moves across a tabletop with a certain speed and experiences a kinetic
frictional force. What happens to the frictional force when the speed of the
block is doubled?

(A)
The force is doubled

(B)
The force is quadrupled

(C)
The force is halved

(D)
The force remains the same

A 10 kg block lies at rest on table. The coefficient of static friction and the
coefficient of kinetic friction between the block and the table are .5 and .25
respectively. A 50 N force is applied horizontally to the block. What is the
magnitude of the frictional force applied to the block?

(A)
24.5 N

(B)
49 N

(C)
50 N

(D)
0 N

See the above problem. What is the acceleration of the block while the force is
being applied, in m/s
2
?

(A)
.1

(B)
2.55

(C)
5

(D)
2.45

Kinetic frictional force is always directly proportional to what other force?

(A)
Electrical force

(B)
Gravitational Force

(C)
Tension Force

(D)
Normal Force

A 2 kg block is moving with constant velocity across a table with a coefficient
of kinetic friction of .5. How much external force is being applied to the
block?

(A)
9.8 N

(B)
O N

(C)
18 N

(D)
24.5 N

The net force on a massless rope is always

(A)
The vector sum of the tension on the rope.

(B)
9.8 N

(C)
0 N

(D)
Not enough information

A 10 kg block is held in equilibrium by a rope hanging vertically from the
ceiling. What is the tension in the rope?

(A)
10 N

(B)
49 N

(C)
5 N

(D)
98 N

A man attaches a rope to a 20 kg block, pulling it across a floor with constant
velocity. The coefficient of kinetic friction between the block and the floor is
.5. What is the tension in the rope?

(A)
98 N

(B)
196 N

(C)
20 N

(D)
Not enough information

A cube has sides of area 2 cm
2
, 3 cm
2
and 4 cm
2
. What side of the cube
will experience the least friction when moved across a rough surface?

(A)
The 2 cm
2
side

(B)
The 3 cm
2
side

(C)
The 4 cm
2
side

(D)
Each side experiences the same amount of friction.

A 10 kg block is placed on a floor, but attached to a rope via a pulley system.
A person pulls on the rope until the tension in the rope is 90 N. What is the
normal force exerted by the floor at this point?

(A)
0 N

(B)
98 N

(C)
8 N

(D)
106 N

If the normal force between two surfaces is doubled, the coefficient of static
friction will

(A)
Double

(B)
Be halved

(C)
Remain the same

(D)
Quadruple

A 10 kg block is pushed horizontally against a vertical wall, with coefficient
of static friction of .25 between the block and the wall. With what force must
the block be pushed against the wall in order to keep the block from falling?

(A)
24.5 N

(B)
392 N

(C)
49 N

(D)
98 N

When traveling in uniform circular motion, all of the following stay constant
EXCEPT

(A)
Speed

(B)
Acceleration

(C)
Radius

(D)
Velocity

When moving in uniform circular motion, the acceleration of a particle is always

(A)
Directed toward the center of the circle

(B)
Proportional to the velocity of the particle

(C)
Proportional to the radius of the circle

(D)
Directed away from the center of the circle

A particle is accelerated in uniform circular motion at a rate of 2 m/s
2
,
around a circle of radius of 18 m. What is the particle's speed, in m/s?

(A)
36

(B)
9

(C)
6

(D)
3

A 10 m rope has a maximum tension of 20 N. What is the most mass it can keep in
uniform circular motion at a velocity of 10 m/s?

(A)
2 kg

(B)
20 kg

(C)
10 kg

(D)
100 kg

Centripetal force always points in what direction?

(A)
Tangential to the circle

(B)
Away from the center of the circle

(C)
Toward the center of the circle

(D)
Perpendicular to the plane of the circle

When a car goes around a curve, the centripetal force is provided by

(A)
The normal force

(B)
The kinetic frictional force

(C)
The gravitational force

(D)
The static frictional force

Which of the following is NOT an example of uniform circular motion?

(A)
A planet orbiting the sun

(B)
The earth rotating about its axis

(C)
A cylinder rolling down an incline

(D)
A car going around a curve at constant velocity

How much must the centripetal force change if the speed around a circle is
doubled?

(A)
It must be doubled

(B)
It must be quadrupled

(C)
It must be halved

(D)
It must stay the same

How much must the centripetal force change if the radius of the circle is
doubled?